Building a PC. I was going to go with a 1000W Psu but psu calculator says otherwise.. how trustworthy are they?

[flashheart85]

Hi there.

I am building a PC. I was going to go for a 1Kw PSU as the PSU was on sale for the same price as a 850W (and i thought it gives me a bit of headroom) However, that PSU is now out of stock for that price. SO, i headed to a PSU calculator and it says the 850W would be more than enough for my needs... How accurate are they?

Here is my setup:
I don't currently have a 4080 (I have a 2070) but i plan to upgrade next year/to a 5080.

[td]
CPU
AMD Ryzen 7 7800X3D

Motherboard:
Asrock X670E Pro RS

RAM
CORSAIR VENGEANCE RGB 32GB DDR5 6000Mhz RAM

SSD
2

HHD x4
GPU Currently have a 2070 but plan on upgrading to a 4080/5070 next year.

Standalone Soundcard

According to the PSU calculator 620W is fine so a 850W is perfect.. Is this correct?
I don't really plan on overclocking the GPU but may try and push a bit more out the CPU for ***** and giggles but its not a deal breaker
Ill have about 5-6 fans and a All in one rad cooler for the CPU.

how accurate are these calculators? Ive seen some say they;re okay if you allow a bit of headroom while others say they're utterly useless.

 

[flashheart85]

7800X3D uses less than 100 watts when gaming (average of 49 in TPU's review) and 2070 around 200, so there's no problem with what you have.

If the 5080 uses 400 watts as the leak suggests, I'd get the 1000 just to account for power spikes, since even though ATX 3.x PSUs are supposed to deal with those it seems prudent given the relatively small cost of 1000 versus 850 relative to the purchase price of a 5080.

Sorry, my mistake. Ill edit this. It'll be either 4080 or a 5070* (Maybe a 5080 if the price is similar to 4080 which leaks suggest it'll be quite a bit more sadly)